As far I can tell the Nokia 610 uses Bluetooth SIM Access Profile, which basically means it uses the bluetooth to access the SIM card and the kit itself is a phone that deals with all the call related stuff. This would mean I would need to buy a new phone, but I really like the idea of having caller display.

I didn't know that Parrot were bringing out a new version, maybe I'll wait for that if it has caller display on.

Cheers

Cris.